/*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef WindowContextFactory_mac_DEFINED
#define WindowContextFactory_mac_DEFINED

#include "tools/window/WindowContext.h"

#include <Cocoa/Cocoa.h>

#include <memory>

namespace skwindow {

struct DisplayParams;

static inline CGFloat GetBackingScaleFactor(NSView* view) {
    #ifdef SK_BUILD_FOR_IOS
    UIScreen* screen = view.window.screen ?: [UIScreen mainScreen];
    return screen.nativeScale;
    #else
    NSScreen* screen = view.window.screen ?: [NSScreen mainScreen];
    return screen.backingScaleFactor;
    #endif
}

struct MacWindowInfo {
    NSView*   fMainView;
};

#if defined(SK_GL) || defined(SK_ANGLE)
static inline NSOpenGLPixelFormat* GetGLPixelFormat(int sampleCount) {
    constexpr int kMaxAttributes = 19;
    NSOpenGLPixelFormatAttribute attributes[kMaxAttributes];
    int numAttributes = 0;
    attributes[numAttributes++] = NSOpenGLPFAAccelerated;
    attributes[numAttributes++] = NSOpenGLPFAClosestPolicy;
    attributes[numAttributes++] = NSOpenGLPFADoubleBuffer;
    attributes[numAttributes++] = NSOpenGLPFAOpenGLProfile;
    attributes[numAttributes++] = NSOpenGLProfileVersion3_2Core;
    attributes[numAttributes++] = NSOpenGLPFAColorSize;
    attributes[numAttributes++] = 24;
    attributes[numAttributes++] = NSOpenGLPFAAlphaSize;
    attributes[numAttributes++] = 8;
    attributes[numAttributes++] = NSOpenGLPFADepthSize;
    attributes[numAttributes++] = 0;
    attributes[numAttributes++] = NSOpenGLPFAStencilSize;
    attributes[numAttributes++] = 8;
    if (sampleCount > 1) {
        attributes[numAttributes++] = NSOpenGLPFAMultisample;
        attributes[numAttributes++] = NSOpenGLPFASampleBuffers;
        attributes[numAttributes++] = 1;
        attributes[numAttributes++] = NSOpenGLPFASamples;
        attributes[numAttributes++] = sampleCount;
    } else {
        attributes[numAttributes++] = NSOpenGLPFASampleBuffers;
        attributes[numAttributes++] = 0;
    }
    attributes[numAttributes++] = 0;
    SkASSERT(numAttributes <= kMaxAttributes);
    return [[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];
}
#endif  // defined(SK_GL) || defined(SK_ANGLE)

#ifdef SK_VULKAN
inline std::unique_ptr<WindowContext> MakeVulkanForMac(const MacWindowInfo&, const DisplayParams&) {
    // No Vulkan support on Mac.
    return nullptr;
}
#endif

#ifdef SK_GL
std::unique_ptr<WindowContext> MakeRasterForMac(const MacWindowInfo&, const DisplayParams&);
std::unique_ptr<WindowContext> MakeGLForMac(const MacWindowInfo&, const DisplayParams&);
#endif

#ifdef SK_ANGLE
std::unique_ptr<WindowContext> MakeANGLEForMac(const MacWindowInfo&, const DisplayParams&);
#endif

#ifdef SK_DAWN
#if defined(SK_GRAPHITE)
std::unique_ptr<WindowContext> MakeGraphiteDawnMetalForMac(const MacWindowInfo&, const DisplayParams&);
#endif
#endif

#ifdef SK_METAL
std::unique_ptr<WindowContext> MakeMetalForMac(const MacWindowInfo&, const DisplayParams&);
#if defined(SK_GRAPHITE)
std::unique_ptr<WindowContext> MakeGraphiteMetalForMac(const MacWindowInfo&, const DisplayParams&);
#endif
#endif

}  // namespace skwindow

#endif